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Frontiers in Zoology Biomed Central Frontiers in Zoology BioMed Central Review Open Access Biogeographical and evolutionary importance of the European high mountain systems Thomas Schmitt Address: Biogeographie, Fachbereich VI, Wissenschaftspark Trier-Petrisberg, Universität Trier, D – 54286 Trier, Germany Email: Thomas Schmitt - [email protected] Published: 29 May 2009 Received: 11 February 2009 Accepted: 29 May 2009 Frontiers in Zoology 2009, 6:9 doi:10.1186/1742-9994-6-9 This article is available from: http://www.frontiersinzoology.com/content/6/1/9 © 2009 Schmitt; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Abstract Europe is characterised by several high mountain systems dominating major parts of its area, and these structures have strongly influenced the evolution of taxa. For species now restricted to these high mountain systems, characteristic biogeographical patterns of differentiation exist. (i) Many local endemics are found in most of the European high mountain systems especially in the Alps and the more geographically peripheral regions of Europe. Populations isolated in these peripheral mountain ranges often have strongly differentiated endemic genetic lineages, which survived and evolved in the vicinity of these mountain areas over long time periods. (ii) Populations of taxa with wide distributions in the Alps often have two or more genetic lineages, which in some cases even have the status of cryptic species. In many cases, these lineages are the results of several centres of glacial survival in the perialpine areas. Similar patterns also apply to the other geographically extended European high mountain systems, especially the Pyrenees and Carpathians. (iii) Populations from adjoining high mountain systems often show similar genetic lineages, a phenomenon best explained by postglacial retreat to these mountains from one single differentiation centre between them. (iv) The populations of a number of species show gradients of genetic diversity from a genetically richer East to a poorer West. This might indicate better glacial survival conditions for this biogeographical group of species in the more eastern parts of Europe. Background in their biogeography and evolution by the complexity of The evolution within species and sibling species com- the European high mountain systems. plexes in Europe is closely connected to the range shifts caused by the cyclic changes between relatively short and The Mediterranean species survived the cold stages of the warm, mostly humid and longer cold and predominantly Pleistocene in the Mediterranean Basin and expanded dry periods [1,2]. These climatic shifts resulted in large northwards during the postglacial [7,8]. These expansions scale range shifts in many species often resulting in dis- are largely shaped by the high mountain systems of the junct distribution pattern during at least one of these Alps and Pyrenees acting as dispersal barriers of different phases [3,4]. However, the effects of these climatic fluctu- strength so that four different paradigms of postglacial ations vary considerably in different ecological and distri- range expansions from the three Mediterranean peninsu- butional groups [5,6], and three major groups can be las can be distinguished [9,10]. In contrast to the assump- distinguished: Mediterranean, continental and arctic/ tions made by de Lattin [6], the continental species, which alpine species [2], which are all to some degree influenced in most cases have not immigrated into Europe from Asi- Page 1 of 10 (page number not for citation purposes) Frontiers in Zoology 2009, 6:9 http://www.frontiersinzoology.com/content/6/1/9 atic core areas during the postglacial, had so called extra- just one of them. As the Alps are by far the most extensive Mediterranean refuge and differentiation centres north of and highest mountain system of Europe, it is not surpris- the typical Mediterranean refugia. These were also ing that the highest number and amount of endemics of strongly influenced by the European mountain systems typical high mountain species is found in this mountain because they offered suitable refuge areas in their non-gla- range, as for example demonstrated by lepidopterans and ciated parts during ice ages and acted as dispersal barriers especially in the little mobile group of the micro-moths during postglacial range shifts [e.g. [11-19]]. [20]. Some of these alpine endemics (in animals as well as in plants) are widespread all over this mountain area, The group of alpine and arctic-alpine species is most stretching almost the entire range from Nice in the south- strongly shaped in their biogeographical and evolutionary west to Vienna in the northeast (in many cases showing history by the geographic location and complexity of the remarkable genetic substructure, see below); while others different European high mountain systems because (i) are more or less local endemics of some parts of the Alps. these species are now restricted to these mountain ranges and (in some cases) the arctic and (ii) most of their actual Two types of hotspots for local endemics of the Alps can distribution areas were covered by extensive ice-shields be distinguished: during the glacial periods [5,20]. In general, we can distin- guish between several different distributional types in (i) Species with their ranges restricted to peripheral these mountain species. Thus, Varga and Schmitt [20] dis- regions of the Alps and mostly confined to lower and tinguish between five major patterns: (i) endemics of the intermediate elevations (e.g. observed in some Erebia Alps restricted to some parts or the entire range, (ii) the species, Lycaenids etc.; for details see Varga & Schmitt "Alpine archipelago" with the species' strongholds in the [20]). The largest concentrations of these local endem- Alps and other parts of the range in adjoining mountain ics are in the regions of the southwestern and the ranges, but without long distance disjunctions, (iii) southeastern Alps, two regions with larger areas at mountain species with long distance disjunctions in lower altitudes not covered by ice during glaciations. Europe (e.g. in the mountains of the Balkan Peninsula, These ice-free areas most probably served as centres of Italy or Iberia), (iv) oro-Mediterranean species with their glacial survival, from where these species only per- ranges mostly restricted to the mountains of the summer- formed altitudinal shifts, but no major range expan- arid high mountain systems of southern Iberia, southern sions over large parts of the deglaciating Alps. As these Italy and the southern Balkan Peninsula and (v) arctic- taxa might have performed these altitudinal shifts alpine species with a disjunction between mountain pop- repeatedly through the climatic fluctuations of the ulations in the South (Alps, often also Pyrenees, Carpathi- Pleistocene, these refuge areas might also be the loca- ans, Balkan high mountain systems) and a large zonal tions of the evolutionary process of speciation [1]. range in the Arctic. However, genetic analyses in this group of species are scarce and in butterflies restricted to the three taxa However, the distribution histories and evolutionary Coenonympha darwiniana [30], C. macromma [30] and processes underlying these different distributional types Erebia sudetica inalpina (Figure 1) [31]. The latter is in mountain species are still poorly understood. There- today confined to the region of Grindelwald (Berner fore, I summarise the known examples and extract the Oberland, northwestern Alps) and most probably sur- repetitive pattern. Examples are preferably taken from the vived at least the last glaciation in a geographically butterflies because this group is well studied and suitable restricted refuge area northwest of the Alpine ice- for biogeographical analyses [e.g. [21-29]], but where nec- shield, likely suffering population bottlenecks and essary other animal groups and even plants are referenced. subsequent genetic erosion [31]. The two Coenonym- In this article, I especially focus on two questions: pha taxa are restricted to the south-central Alps (C. dar- winiana) and the Alpes Maritimes (C. macromma). (1) Which repetitive biogeographical and evolutionary Both might have survived also at least the last ice age patterns are characteristic for European mountain species? at lower elevations close to their recent distributions [30]. (2) What is the influence of the climatic cycles on their dif- ferentiation? (ii) Species restricted to some parts of the Inner Alps, as for example a number of (often flightless) micro- Endemics and endemic genetic lineages of high moth species [32] and beetles [5], but only a single mountain systems butterfly species (i.e. Erebia nivalis) [20]. These species Endemics of the Alps in general are confined to high alpine habitats and Most of the larger European high mountain systems pos- may have survived glaciations in situ at so called Nuna- sess endemic species (or at least subspecies) confined to taks (i.e. small ice-free areas topping over the ice- Page 2 of 10 (page number not for citation purposes) Frontiers in Zoology 2009, 6:9 http://www.frontiersinzoology.com/content/6/1/9 e in h R Danube Inn e n ô a S Drau Rhône Po Etsch EuropeanFigureGeographicmtDNA 2 sequences mountain distribution ofsystems the of caddisfly
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